<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        .loader {
            position: relative;
            font-size: 16px;
            width: 5.5em;
            height: 5.5em;
        }

        .loader:before {
            content: '';
            position: absolute;
            transform: translate(-50%, -50%) rotate(45deg);
            height: 100%;
            width: 4px;
            background: #fff;
            left: 50%;
            top: 50%;
        }

        .loader:after {
            content: '';
            position: absolute;
            left: 0.2em;
            bottom: 0.18em;
            width: 1em;
            height: 1em;
            background-color: orange;
            border-radius: 15%;
            animation: rollingRock 2.5s cubic-bezier(.79, 0, .47, .97) infinite;
        }

        @keyframes rollingRock {
            0% {
                transform: translate(0, -1em) rotate(-45deg);
            }

            5% {
                transform: translate(0, -1em) rotate(-50deg);
            }

            20% {
                transform: translate(1em, -2em) rotate(47deg);
            }

            25% {
                transform: translate(1em, -2em) rotate(45deg);
            }

            30% {
                transform: translate(1em, -2em) rotate(40deg);
            }

            45% {
                transform: translate(2em, -3em) rotate(137deg);
            }

            50% {
                transform: translate(2em, -3em) rotate(135deg);
            }

            55% {
                transform: translate(2em, -3em) rotate(130deg);
            }

            70% {
                transform: translate(3em, -4em) rotate(217deg);
            }

            75% {
                transform: translate(3em, -4em) rotate(220deg);
            }

            100% {
                transform: translate(0, -1em) rotate(-225deg);
            }
        }
    </style>
</head>
<body>
    <div class="loader"></div>
</body>
</html>
